from logging.handlers import RotatingFileHandler

from flask import Flask,render_template,g
from flask_sqlalchemy import SQLAlchemy
from redis import StrictRedis
from flask_wtf.csrf import CSRFProtect,generate_csrf
from flask_session import Session
from config import config
import logging
from info.utils.common import do_index_class,user_login



db = SQLAlchemy()

def set_log(config_name):
    # 设置日志的记录等级
    logging.basicConfig(level=config[config_name].LOG_LEVEL) # 调试debug级
    # 创建日志记录器，指明日志保存的路径、每个日志文件的最大大小、保存的日志文件个数上限
    file_log_handler = RotatingFileHandler("logs/log", maxBytes=1024*1024*100, backupCount=10)
    # 创建日志记录的格式 日志等级 输入日志信息的文件名 行数 日志信息
    formatter = logging.Formatter('%(levelname)s %(filename)s:%(lineno)d %(message)s')
    # 为刚创建的日志记录器设置日志记录格式
    file_log_handler.setFormatter(formatter)
    # 为全局的日志工具对象（flask app使用的）添加日志记录器
    logging.getLogger().addHandler(file_log_handler)


redis_store = None  # type: StrictRedis

def create_app(config_name):
    set_log(config_name)
    app = Flask(__name__)

    app.config.from_object(config[config_name])

    # db = SQLAlchemy(app)
    db.init_app(app)
    global redis_store
    redis_store = StrictRedis(host = config[config_name].REDIS_HOST, port = config[config_name].REDIS_PORT,decode_responses=True)

    @app.after_request
    def after_request(response):
        # 通过wtf这个扩展给我们生成的token值
        csrf_token = generate_csrf()
        response.set_cookie("csrf_token", csrf_token)

        return response

    @app.errorhandler(404)
    @user_login
    def get_404_error(e):
        data = {
            "user_info": g.user.to_dict() if g.user else None
        }
        return render_template("news/404.html", data=data)

    CSRFProtect(app)

    Session(app)


    # 添加过滤器
    app.add_template_filter(do_index_class,"index_class")
    # 注册蓝图
    from info.modules.index import index_blu
    app.register_blueprint(index_blu)

    from info.modules.passport import passport_blu
    app.register_blueprint(passport_blu)

    from info.modules.news import news_blu
    app.register_blueprint(news_blu)

    from info.modules.profile import profile_blu
    app.register_blueprint(profile_blu)

    from info.modules.admin import admin_blu
    app.register_blueprint(admin_blu)

    return app